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Analog Devices Inc. LTC3374EUHF#TRPBF
- Part No.:
- LTC3374EUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3374EUHF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,455
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Product details
Overview
LTC3374EUHF#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency 8-channel synchronous buck DC/DC regulator IC with independent 1A per channel capability, 2.25V–5.5V input range per channel, 0.8V–VIN output range, and programmable 1MHz–3MHz switching frequency. It enables flexible power rail generation in space-constrained industrial and automotive control systems.
For engineers reviewing the LTC3374EUHF#TRPBF datasheet, LTC3374EUHF#TRPBF pinout, LTC3374EUHF#TRPBF application, or LTC3374EUHF#TRPBF equivalent, key selection criteria include per-channel enable precision (±40mV threshold hysteresis), die temperature monitoring via analog TEMP pin (150mV @ 25°C, 6.75mV/°C slope), and master-slave parallel configuration support for up to 4A per output using shared inductors.
Technical Context
The LTC3374EUHF#TRPBF integrates eight fully independent synchronous buck regulators, each with dedicated VIN, SW, FB, and EN pins, enabling true multi-rail flexibility with separate input supplies. All channels share a common oscillator architecture that supports resistor-programmed (RT pin), external synchronization (SYNC pin), or internal 2MHz default operation.
Its thermal management includes an on-die temperature sensor (TEMP pin) with ±2°C accuracy over –40°C to 125°C, overtemperature shutdown at 165°C with 10°C hysteresis, and phased 90° switching to reduce input ripple. The MODE pin globally selects between Burst Mode® (light-load efficiency) and forced continuous conduction mode (low-noise regulation).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 8 independent 1A synchronous buck regulators, configurable as 1A–4A per output via master-slave parallelization |
| Input voltage range | 2.25V to 5.5V per channel - supports diverse supply domains including 3.3V, 5V, and battery-derived rails |
| Output voltage range | 0.8V to VIN - enables generation of sub-1V core voltages and scalable intermediate rails |
| Switching frequency | 1MHz to 3MHz (programmable via RT resistor or SYNC signal) - balances efficiency, size, and EMI performance |
| Enable threshold accuracy | ±40mV hysteresis (VEN_HI = 400mV typ., VEN_LO = 340mV typ.) - ensures reliable autonomous power-up sequencing |
| DIE temperature monitor | Analog TEMP pin: 150mV @ 25°C, 6.75mV/°C slope - provides real-time junction temperature feedback without external sensors |
| Package thermal resistance | θJA = 34°C/W (QFN UHF) - enables 1.5W+ continuous dissipation with standard 2-layer PCB copper pour |
Pinout & Package
Package: 38-lead 5mm × 7mm plastic QFN (UHF) with exposed GND pad (Pin 39), rated for –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 | Feedback input for buck regulators 1–8 | Connects to resistor divider to set output voltage; shorting FBx to VINx configures master-slave parallel operation |
| VIN1–VIN8 | Independent input supply for each buck channel | Each accepts 2.25V–5.5V; must be bypassed with ≥10µF ceramic capacitor; supports mixed-supply system architectures |
| SW1–SW8 | Switch node for buck regulators 1–8 | Connects to external inductor; requires low-inductance layout to minimize switching losses and EMI |
| EN1–EN8 | Active-high enable inputs | Enable individual channels; precision thresholds (400mV typ.) allow deterministic power sequencing without external logic |
| PGOOD_ALL | Open-drain global power-good indicator | Asserts low if any enabled regulator's output drops >7.5% below target - simplifies system-level fault detection |
| MODE | Global operating mode select | Low = Burst Mode® (high light-load efficiency); High = forced continuous mode (fixed-frequency, low ripple) |
| SYNC / RT | Oscillator control interface | SYNC accepts external clock (1–3MHz); RT sets frequency via resistor (400kΩ = 2MHz); both pins must not float |
| TEMP | Analog die temperature monitor | Outputs linear voltage (150mV @ 25°C, +6.75mV/°C) - enables closed-loop thermal management or safety cutoff |
| VCC | Internal bias supply | Requires ≥10µF ceramic bypass; powers internal logic and gate drivers; 2.7V–5.5V operating range |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel independent input supplies | Enables heterogeneous power domain integration (e.g., 3.3V I/O + 2.5V analog + 1.8V core) without level-shifting or LDO pre-regulation |
| Phased 90° switching across all channels | Reduces peak input current by ~30% and lowers RMS input capacitor ripple current - cuts required bulk capacitance by up to 50% |
| Master-slave parallel configuration | Up to four adjacent channels can share one inductor to deliver 2A, 3A, or 4A outputs - reduces BOM count and board area vs discrete solutions |
| Precision enable thresholds with hysteresis | Ensures monotonic, glitch-free startup across wide temperature range (–40°C to 125°C) - eliminates need for external sequencers in multirail systems |
| Integrated die temperature sensing | Provides direct junction temperature measurement with ±2°C accuracy - enables dynamic frequency scaling or graceful derating before thermal shutdown |
Applications
| Industrial PLC I/O Modules | Automotive ADAS Domain Controllers |
|---|---|
Use Scenario: Powering isolated analog front-ends, digital isolators, and microcontroller peripherals in modular I/O cards with strict EMC and thermal constraints. IC Role / Device Role / Timing Role: Primary multirail power manager delivering 1.2V, 1.8V, 2.5V, 3.3V, and 5V from a single 5V or 12V intermediate bus. Use Value: Eliminates six discrete buck converters and associated layout complexity while maintaining channel independence and sequencing control. |
Use Scenario: Supplying vision processor cores, ISP, memory interfaces, and sensor hubs in compact camera ECU designs requiring high reliability and thermal awareness. IC Role / Device Role / Timing Role: Centralized power subsystem managing 8 critical voltage rails with real-time die temperature feedback for functional safety compliance. Use Value: Reduces thermal hotspots via phased switching and enables ASIL-B–compatible thermal monitoring without external sensors. |
| Communications Baseband Units | Test & Measurement Signal Generators |
Use Scenario: Generating clean, low-noise bias voltages for RF transceivers, ADC/DACs, and FPGA I/O banks in 5G small cell baseband boards. IC Role / Device Role / Timing Role: Dual-mode regulator supporting Burst Mode® for standby power savings and forced continuous mode during active signal processing. Use Value: Achieves <8mVpp output ripple in forced mode while maintaining >90% efficiency at 10mA load in Burst Mode®. |
Use Scenario: Providing stable, independently adjustable rails for precision DAC references, op-amp supplies, and FPGA configuration in benchtop instruments. IC Role / Device Role / Timing Role: Programmable multichannel source with synchronized switching (via SYNC pin) to avoid beat frequencies in sensitive analog sections. Use Value: Enables simultaneous switching of multiple rails at identical frequency and phase offset - suppresses inter-rail coupling and improves SFDR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8859GQ-Z (Monolithic Power) | 4-channel, 3A/channel; fixed 2.2MHz fSW; no die temp monitor; smaller 4×4mm QFN | Lacks per-channel VIN independence and thermal sensing - suitable only for homogeneous rail systems | Select when board space is critical and all rails derive from same input; not viable for mixed-supply or safety-critical thermal monitoring |
| TPS65270PWPR (Texas Instruments) | 3-channel, 3A/2A/2A; integrated LDOs; I²C programmability; no PGOOD_ALL or TEMP pin | Offers digital configurability but no analog temperature output or global PGOOD - requires firmware integration | Prefer for systems needing runtime voltage adjustment via host MCU; avoid where analog thermal feedback or hardware fault signaling is mandatory |
Compared with MP8859GQ-Z and TPS65270PWPR, the LTC3374EUHF#TRPBF uniquely delivers eight independent 1A bucks with per-rail input flexibility, hardware-based thermal monitoring, and deterministic analog power-good signaling - making it optimal for high-integrity, thermally aware multirail systems where software intervention is undesirable or unsafe.
Availability
LTC3374EUHF#TRPBF is available at Aetrix Electronics and suitable for industrial automation, automotive ADAS, and communications infrastructure applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3374EUHF#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification standards.
The LTC3374EUHF#TRPBF belongs to Linear's high-density multichannel power regulator family, designed specifically for space-constrained systems requiring independent, sequenced, and thermally monitored voltage rails without compromising efficiency or reliability.
FAQ
What is the maximum output current achievable per channel using LTC3374EUHF#TRPBF?
The LTC3374EUHF#TRPBF supports up to 4A per output by paralleling up to four adjacent buck channels (e.g., BUCK1–BUCK4) with a shared inductor and synchronized switching. This configuration is validated in the datasheet with IFWD4 = 9.2A typical PMOS current limit and requires proper thermal design due to increased power density. Individual channels deliver 1A continuously.
Does LTC3374EUHF#TRPBF support independent input supplies for each channel?
Yes, LTC3374EUHF#TRPBF explicitly supports independent VIN1–VIN8 inputs, each rated for 2.25V–5.5V. This allows heterogeneous power domain integration - for example, powering BUCK1 from a 5V bus while BUCK2 draws from a 3.3V LDO - without cross-coupling or external isolation components.
How does the TEMP pin on LTC3374EUHF#TRPBF function in system thermal management?
The TEMP pin on LTC3374EUHF#TRPBF outputs an analog voltage proportional to die temperature (150mV at 25°C, +6.75mV/°C). This enables direct ADC monitoring for closed-loop thermal throttling, predictive derating, or safety cutoff at 165°C (OT shutdown). No calibration is required for ±2°C accuracy across –40°C to 125°C.
Can LTC3374EUHF#TRPBF be synchronized to an external clock, and what is the valid frequency range?
Yes, LTC3374EUHF#TRPBF accepts external synchronization via the SYNC pin across 1MHz–3MHz. The device automatically adapts slope compensation to maintain stability. Pulse width must exceed 40ns (tHIGH/tLOW), and the SYNC signal must be CMOS-compatible (VIH ≥ 1.2V, VIL ≤ 0.4V). Floating SYNC defaults to RT-programmed operation.
What package type and thermal performance does LTC3374EUHF#TRPBF use?
LTC3374EUHF#TRPBF uses a 38-lead 5mm × 7mm plastic QFN (UHF) with exposed GND pad. Its thermal resistance is θJA = 34°C/W on a standard 2-layer PCB with 2oz copper and thermal vias under the pad. This enables >1.5W total dissipation before reaching 125°C junction temperature under typical airflow conditions.
LTC3374EUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 8
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3374EUHF#TRPBF FAQ
1.How can I place an order for LTC3374EUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374EUHF#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3374EUHF#TRPBF reliable?
The price and inventory of LTC3374EUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374EUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3374EUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374EUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374EUHF#TRPBF?
LTC3374EUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374EUHF#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3374EUHF#TRPBF?
For technical support, including LTC3374EUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374EUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3374EUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3374EUHF#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3374EUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3374EUHF#TRPBF?
All LTC3374EUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374EUHF#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3374EUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3374EUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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